Answer:
Some people believe Pluto is a planet or because scientist has saw this planet and they thought this planet is big but scientist compare the size of Pluto, Triton (Neptune's Moon) and Earth moon (our moon) but the scientist found that this is small and they also compare to Eris, still small and scientist say "if Pluto is a planet, Eris must be to" so this is a dwarf planet NOT PLANET but I knew Dwarf planets ARE BABY PLANETS OK!